The United States on Thursday placed Burma on its list of worst offenders of human trafficking and accused it of using child soldiers amid global criticism over human rights abuses by the country’s military against the minority Rohingya Muslims.

A police witness in the case against two Reuters reporters accused of possessing state secrets in Burma is “unreliable,” the reporters’ lawyer said on Monday, because he obtained testimony from previous witnesses, in violation of police code.

The US government’s aid chief urged Burma on Sunday to take “concrete steps” to guarantee the rights of Rohingya Muslims and to show sincerity in that endeavour in order to encourage hundreds of thousands who have fled the country to return.

Around 60 babies a day are being born in vast refugee camps in Bangladesh, sheltering hundreds of thousands of mainly Rohingya Muslims who have fled Burma, the United Nations children’s agency UNICEF says.

The United States indirectly criticised China on Monday for shielding Burma from strong UN Security Council action over a military crackdown against mainly Rohingya Muslims that the US and other countries have denounced as ethnic cleansing.

Burma’s perennially contentious relationship with the Organisation of Islamic Cooperation moved no closer toward amicability this week as the two sides traded barbs over the situation in Rakhine State, where a mass exodus of Rohingya Muslims tied to allegations of ethnic cleansing has heaped global censure on the government.

The UN Security Council has urged Burma’s government to carry out transparent investigations into accusations of violence against mainly Rohingya Muslims in Rakhine State and to allow immediate aid access to the region.

China does not want the UN Security Council to tell Burma that credible, transparent investigations into accusations of violence against mainly Rohingya Muslims are important, according to proposed amendments to a British-drafted statement.

UN Security Council envoys began a four-day visit to Bangladesh and Burma on Saturday to see firsthand the aftermath of a Burmese military crackdown that Britain, the United States and others have denounced as ethnic cleansing of Rohingya Muslims.

North Korean leader Kim Jong-un and South Korean President Moon Jae-in embraced after pledging on Friday to work for the “complete denuclearisation of the Korean peninsula,” punctuating a day of smiles and handshakes at the first inter-Korean summit in more than a decade.

The US government is conducting an intensive examination of alleged atrocities against Rohingya Muslims, documenting alleged atrocities in an investigation that could be used to prosecute Burma’s military for crimes against humanity, said US officials.

Southeast Asian leaders will focus on trade wars, the crisis in Burma and security tensions in the disputed South China Sea at a summit this weekend, but it’s highly unlikely there will be any headline-grabbing progress on the issues.

Burma’s army chief Min Aung Hlaing has told military personnel in the country that they must obey the law, citing as an example the sentencing of seven soldiers for a massacre of Rohingya Muslim men that was the subject of a Reuters investigation.

A Burmese minister expressed concerns on Thursday about “very poor conditions” in Rohingya refugee camps in neighbouring Bangladesh, and said repatriation of the Muslim minority should start as soon as possible due to the coming monsoon season.

Burma on Saturday repatriated the first Rohingya family from nearly 700,000 refugees who have fled to Bangladesh, after months of fraught talks with Dhaka and amid the United Nations’ warnings that the country is not ready for their return.

Seven Burmese soldiers have been sentenced to “10 years in prison with hard labour in a remote area” for participating in a massacre of 10 Rohingya Muslim men in a village in northwestern Rakhine State last September, the army said on Tuesday.

Aung San Suu Kyi’s government is opening the economy and growth is rebounding in Burma, though the possibility of broader Western sanctions over the Rohingya crisis is nevertheless giving some foreign investors pause, according to a senior IMF official.